PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/30-18:12:30
G07     9.1            67.3                9.6 +/-    0.73      10.3 +/-    0.73  0.040 / 0.050
G08     69.7           51.6               10.7 +/-    0.52      13.3 +/-    0.52  0.050 / 0.050
G09     180.8          52.4               10.6 +/-    1.56      13.0 +/-    1.56  0.060 / 0.250
G11     133.3          25.7               12.9 +/-    1.59      24.7 +/-    1.59  0.060 / 0.190
G23     158.1          17.0               11.9 +/-    1.89      28.3 +/-    1.89  0.030 / 0.040
G27     41.2           18.4                8.7 +/-    0.89      19.9 +/-    0.89  0.030 / 0.050
G28     256.7          44.4               10.8 +/-    1.14      14.7 +/-    1.14  0.040 / 0.120
G30     319.6          50.1                9.7 +/-    0.80      12.2 +/-    0.80  0.050 / 0.080